Here’s news in brief from around the world in energy storage with liquid metal battery maker Ambri, a German government-funded sodium-ion initiative, and ESS Inc’s iron flow battery project at Amsterdam.

Vehicle-to-grid (V2G) technology has gone into use at Johan Cruyff Arena in Amsterdam, with energy infrastructure installed onsite including a 3MW battery energy storage system allowing visitors to both charge their cars at the stadium and put power back into it.